OpenJDK 7 could be made to crash or run programs as your login if itopened a specially crafted Java applet.

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Ubuntu Security Notice USN-1693-1
January 16, 2013
openjdk-7 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.10
Summary:
OpenJDK 7 could be made to crash or run programs as your login if it
opened a specially crafted Java applet.
Software Description:
- openjdk-7: Open Source Java implementation
Details:
It was discovered that OpenJDK 7's security mechanism could be bypassed via
Java applets. If a user were tricked into opening a malicious website, a
remote attacker could exploit this to perform arbitrary code execution as
the user invoking the program.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 12.10:
icedtea-7-jre-cacao 7u9-2.3.4-0ubuntu1.12.10.1
icedtea-7-jre-jamvm 7u9-2.3.4-0ubuntu1.12.10.1
openjdk-7-jre 7u9-2.3.4-0ubuntu1.12.10.1
openjdk-7-jre-headless 7u9-2.3.4-0ubuntu1.12.10.1
openjdk-7-jre-lib 7u9-2.3.4-0ubuntu1.12.10.1
openjdk-7-jre-zero 7u9-2.3.4-0ubuntu1.12.10.1
After a standard system update you need to restart your browser to make all
the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1693-1
CVE-2012-3174, CVE-2013-0422
Package Information:
https://launchpad.net/ubuntu/+source/openjdk-7/7u9-2.3.4-0ubuntu1.12.10.1